$8\mathrm{.}85$ The $3-$in$.-$diameter rod carries a bending moment of $2210lb*ft$ and the torque $T.$ Determine the largest $T$ that can be applied if the working stresses are ${}_w=18$ksi and ${}_w=14$ksi.

Answer is $63\mathrm{.}68$ kip$-$in$.$